19300-ZY6-003 Honda Marine Thermostat | Genuine OEM Outboard Part

🔧 Product Description

Genuine Honda Marine 50°C Thermostat Assembly - Part Number: 19300-ZY6-003

A genuine Honda 50°C thermostat for the later BF75D-BF150 inline-four EFI family. Several engines use this thermostat together with a second thermostat of a different temperature, making installation position important.

⚙️ Key Features

• Factory opening temperature approximately 50°C

• Used in later Honda inline-four EFI engines

• Wax-element temperature control

• Direct OEM replacement

• Position-specific on dual-thermostat engines

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• No supersession; current Honda OEM reference

OEM / Related Numbers:

• Honda: 19300-ZY6-003

Aftermarket / Verified Equivalents:

• Recmar: REC6E5-12411-30

• Aftermarket reference: WA 6E5-12411-30

🚤 Compatibility

Commonly used on:

• Honda Marine four-stroke outboard cooling-system applications

Typically suits:

• Engine models:

• BF75DK0/DK2/DK3/DK4

• BF80A and BF80AK1

• BF90DK0/DK2/DK4/DK5

• BF100A and BF100AK1

• BF115D and BF115DK1

• BF135A4/AK2

• BF150A4/AK2

• BFT80AK1 and BFT100AK1

• HP Range: 75HP-150HP

• Engine Type: Inline four-cylinder EFI four-stroke outboard

• Year Range: Approximately 2004 onward

🔌 Function

Begins opening near 50°C to regulate its assigned cooling passage and balance engine temperature across the cylinder head and exhaust circuit.

Common signs of failure:

• Overheat alarm or power reduction

• Engine operates too cold

• Uneven temperature between cooling circuits

• Salt deposits restrict thermostat movement

• Thermostat opens late or fails to close

📦 Condition

• Genuine Honda Marine OEM part

• Brand new

• Supplied in original or equivalent packaging